Chlorzoxazone

Chlorzoxazone is a muscle relaxer that is used along with rest and physical therapy to treat conditions affecting skeletal muscles, such as pain or injury.

Chlorzoxazone may also be used for reasons not mentioned in this medication guide.

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

Chlorzoxazone is usually taken 3 or 4 times per day. Follow your doctor's dosing instructions very carefully.

Chlorzoxazone is only part of a complete treatment plan that may also include rest, physical therapy, or other pain relief methods. Follow your doctor's instructions.

Store at room temperature away from moisture and heat.

Follow all instructions on your medicine label and package. Inform each of your healthcare providers about all your medical conditions, allergies, and all medicines you are taking.

You should not use chlorzoxazone if you are allergic to it.

Tell your doctor if you have ever had:

• liver disease.

Tell your doctor if you are pregnant or breast-feeding.

Chlorzoxazone is not approved for use by anyone younger than 18 years old.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

chlorzoxazone may cause serious side effects. Stop using chlorzoxazone and call your doctor right away if you have:

• a light-headed feeling, like you might pass out;
• skin rash, itching, or redness;
• liver problems--stomach pain (upper right side), loss of appetite, vomiting, fever, unusual tiredness, dark urine, or jaundice (yellowing of the skin or eyes); or
• signs of stomach bleeding--bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds.

Common side effects of chlorzoxazone may include:

• drowsiness;
• dizziness; or
• general ill feeling.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Usual Adult Dose for Muscle Spasm:

Initial dose: 250 to 500 mg orally 3 to 4 times a day -If inadequate response, may increase to 750 mg orally 3 or 4 times a dayComments: -The dose should be reduced as improvement occurs. Use: As an adjunct to rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions.

Take the medicine as soon as you remember, but if it is almost time for your next dose, skip the missed dose. Do not take two doses at once.

Seek emergency medical help or call the Poison Help line at 1-800-222-1222.

Signs of an overdose may include nausea, vomiting, diarrhea, extreme drowsiness, headache, muscle weakness, shallow breathing, or fainting.

Consuming alcohol while taking chlorzoxazone can lead to side effects.

Do not drive or engage in dangerous activities until you understand how this medicine will affect you. Your reactions may be affected.

Using chlorzoxazone with other medications that cause drowsiness can make you feel even more sleepy. Talk to your doctor before taking opioid medication, a sleeping pill, a muscle relaxer, or medicine for anxiety or seizures.

Other medications may impact how chlorzoxazone works, including both prescription and over-the-counter medicines, vitamins, and herbal products. Inform your doctor about all the medicines you are currently taking and any new medicines you begin or stop using.